/* App Shell: Layout + Components */

:root {
  --color-bg: #ffffff;
  --color-fg: #1a1a1a;
  --color-fg-muted: #666666;
  --color-border: #e0e0e0;
  --color-brand: #2563eb;
  --color-brand-hover: #1d4ed8;
  --color-brand-strong: #3730a3;
  --color-error: #dc2626;
  --color-error-strong: #991b1b;
  --color-error-deep: #7f1d1d;
  --color-error-hover: #b91c1c;
  --color-success: #16a34a;
  --color-success-strong: #15803d;
  --color-warning: #ea580c;
  --color-warning-strong: #9a3412;
  --color-shadow: rgba(0, 0, 0, 0.1);
  --color-surface: #f9f9f9;
  --color-surface-muted: #f0f0f0;
  --color-surface-info: #e3f2fd;
  --color-surface-info-strong: #e0f2fe;
  --color-surface-info-soft: #dbeafe;
  --color-surface-primary: #eef2ff;
  --color-surface-neutral: #e2e8f0;
  --color-surface-warning-soft: #ffedd5;
  --color-surface-warning-bright: #fef3c7;
  --color-surface-error-soft: #fee2e2;
  --color-surface-success-soft: #dcfce7;
  --color-info-strong: #075985;
  --color-info-deep: #0c4a6e;
  --color-neutral-strong: #334155;
  
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background-color: var(--color-bg);
  color: var(--color-fg);
  font-family: var(--font-family);
  font-size: var(--font-size-md);
  line-height: 1.5;
}

a {
  color: var(--color-brand);
  text-decoration: none;
}

a:hover {
  color: var(--color-brand-hover);
  text-decoration: underline;
}

button {
  font-family: inherit;
  cursor: pointer;
}

.text-muted {
  color: var(--color-fg-muted);
}

/* App Container (top nav + sidebar layout) */
.app-shell {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.app-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-lg);
}

.app-header-brand {
  font-size: var(--font-size-xl);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.app-header-brand a {
  color: var(--color-fg);
}

.app-header-user {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-fg-muted);
}

.app-header-user strong {
  color: var(--color-fg);
  font-weight: 600;
}

.app-body {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.app-sidebar {
  width: 200px;
  background-color: var(--color-surface);
  border-right: 1px solid var(--color-border);
  padding: var(--spacing-lg) 0;
  overflow-y: auto;
}

.app-sidebar-nav {
  list-style: none;
  margin: 0;
  padding: 0;
}

.app-sidebar-nav li {
  margin: 0;
}

.app-sidebar-nav a {
  display: block;
  padding: var(--spacing-md) var(--spacing-lg);
  color: var(--color-fg-muted);
  font-size: var(--font-size-sm);
  border-left: 2px solid transparent;
  transition: all 0.2s ease;
}

.app-sidebar-nav a:hover {
  background-color: var(--color-surface-muted);
  color: var(--color-fg);
  text-decoration: none;
}

.app-sidebar-nav a.active {
  background-color: var(--color-surface-info);
  border-left-color: var(--color-brand);
  color: var(--color-brand);
  font-weight: 500;
}

.app-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-xl);
}

.app-content-header {
  margin-bottom: var(--spacing-2xl);
}

.app-content-header h1 {
  margin: 0 0 var(--spacing-md) 0;
  font-size: var(--font-size-2xl);
}

.app-content-header p {
  margin: 0;
  color: var(--color-fg-muted);
}

/* Auth Panel (login prompt) */
.auth-panel {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  max-width: 400px;
  margin: var(--spacing-2xl) auto;
}

.auth-panel h2 {
  margin: 0 0 var(--spacing-lg) 0;
  font-size: var(--font-size-lg);
}

.auth-panel-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.auth-panel-input {
  padding: var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-md);
}

.auth-panel-input:focus {
  outline: none;
  border-color: var(--color-brand);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}

.auth-panel-button {
  padding: var(--spacing-md);
  background-color: var(--color-brand);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-md);
  font-weight: 500;
  transition: background-color 0.2s ease;
}

.auth-panel-button:hover {
  background-color: var(--color-brand-hover);
}

.auth-panel-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.auth-panel-status {
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  background-color: var(--color-surface-info);
  color: var(--color-brand);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-md);
}

.auth-panel-link-button {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  margin-top: var(--spacing-md);
  background-color: var(--color-success);
  color: white;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  text-decoration: none;
  transition: background-color 0.2s ease;
}

.auth-panel-link-button:hover {
  background-color: var(--color-success-strong);
  text-decoration: none;
}

/* Tables */
.app-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.app-table thead {
  background-color: var(--color-surface);
}

.app-table th {
  padding: var(--spacing-md) var(--spacing-lg);
  text-align: left;
  font-weight: 600;
  font-size: var(--font-size-sm);
  color: var(--color-fg-muted);
  border-bottom: 1px solid var(--color-border);
}

.app-table td {
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.app-table tbody tr:hover {
  background-color: var(--color-surface);
}

.app-table tbody tr:last-child td {
  border-bottom: none;
}

/* Toolbar + Inputs */
.app-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.app-toolbar-group {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.app-input {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  min-width: 260px;
  font-size: var(--font-size-sm);
}

.app-input:focus {
  outline: none;
  border-color: var(--color-brand);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}

/* Badges */
.app-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  background-color: var(--color-surface-primary);
  color: var(--color-brand-strong);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.app-badge--info {
  background-color: var(--color-surface-info-strong);
  color: var(--color-info-strong);
}

.app-badge--low {
  background-color: var(--color-surface-neutral);
  color: var(--color-neutral-strong);
}

.app-badge--normal {
  background-color: var(--color-surface-info-strong);
  color: var(--color-info-strong);
}

.app-badge--high {
  background-color: var(--color-surface-warning-soft);
  color: var(--color-warning-strong);
}

.app-badge--urgent {
  background-color: var(--color-surface-error-soft);
  color: var(--color-error-strong);
}

/* Helpers */
.app-empty {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--color-fg-muted);
}

.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.85em;
}

/* Cards */
.app-card {
  background-color: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.app-card h3 {
  margin: 0 0 var(--spacing-md) 0;
  font-size: var(--font-size-lg);
}

.app-card p {
  margin: 0;
  color: var(--color-fg-muted);
}

/* Forms */
.app-form-group {
  margin-bottom: var(--spacing-lg);
}

.app-form-group label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  font-size: var(--font-size-sm);
}

.app-form-group input,
.app-form-group textarea,
.app-form-group select {
  width: 100%;
  max-width: 500px;
  padding: var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--font-size-md);
}

.app-form-group input:focus,
.app-form-group textarea:focus,
.app-form-group select:focus {
  outline: none;
  border-color: var(--color-brand);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}

.support-hint {
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--color-fg-muted);
}

.support-meta {
  font-size: var(--font-size-sm);
  color: var(--color-fg-muted);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-brand);
  color: white;
}

.btn-primary:hover {
  background-color: var(--color-brand-hover);
}

.btn-secondary {
  background-color: var(--color-surface-muted);
  color: var(--color-fg);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background-color: var(--color-border);
}

.btn-danger {
  background-color: var(--color-error);
  color: white;
}

.btn-danger:hover {
  background-color: var(--color-error-hover);
}

.btn-small {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-sm);
}

/* Alerts */
.alert {
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-size-sm);
}

.alert-info {
  background-color: var(--color-surface-info-soft);
  color: var(--color-info-deep);
  border-left: 4px solid var(--color-brand);
}

.alert-success {
  background-color: var(--color-surface-success-soft);
  color: var(--color-success-strong);
  border-left: 4px solid var(--color-success);
}

.alert-error {
  background-color: var(--color-surface-error-soft);
  color: var(--color-error-deep);
  border-left: 4px solid var(--color-error);
}

.status-ok {
  background-color: var(--color-surface-success-soft);
  color: var(--color-success-strong);
  border-left: 4px solid var(--color-success);
}

.status-err {
  background-color: var(--color-surface-error-soft);
  color: var(--color-error-deep);
  border-left: 4px solid var(--color-error);
}

.alert-warning {
  background-color: var(--color-surface-warning-bright);
  color: var(--color-warning-strong);
  border-left: 4px solid var(--color-warning);
}

/* Loading */
.loading {
  display: inline-block;
  width: 1em;
  height: 1em;
  border: 2px solid var(--color-surface-muted);
  border-top: 2px solid var(--color-brand);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Responsive */
@media (max-width: 768px) {
  .app-body {
    flex-direction: column;
  }
  
  .app-sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
    max-height: 120px;
    overflow-x: auto;
  }
  
  .app-sidebar-nav {
    display: flex;
    gap: 0;
  }
  
  .app-sidebar-nav a {
    padding: var(--spacing-md);
    border-left: none;
    border-bottom: 2px solid transparent;
    white-space: nowrap;
  }
  
  .app-sidebar-nav a.active {
    border-left: none;
    border-bottom-color: var(--color-brand);
  }
  
  .app-content {
    padding: var(--spacing-lg);
  }
  
  .app-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .app-table {
    font-size: var(--font-size-sm);
  }
  
  .app-table th,
  .app-table td {
    padding: var(--spacing-sm);
  }
}